LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION

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LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION ( limits-small-scale-pressure-swing-adsorption )

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to determine the relevant mass transfer parameters for the particles used in this study. Finally the extracted kinetic data was used to better understand what the rate limiting mechanism is for columns packed with small LiLSX particles. 6.1.1 Experimental MTC Measurement In Chapter 4 a case study was used to demonstrate how the overall MTC (equation 4.1) was affected by the estimation of axial dispersion effects. Case 1 and Case 2 estimate koverall using assumptions applied to large particles to determine DL, while Case 3 and Case 4 used assumptions more applicable to small particles. Figure 6.1 directly overlays the results of the breakthrough study on the results of the case study in Figure 4.2 to determine the case that best describes the data. It is immediately clear the experimental MTC is not constant, but increases with Reynolds number as expected based on the predictions. It is also clear that either the case 3 or case 4 prediction most closely matches experimental data. These cases reflect higher axial dispersion effects through a higher estimate of DL compared to the case 1 or case 2 prediction. Results from a similar study with the same particle size are also represented in Figure 6.1.32 In that study, the focus was to determine the effect of temperature and pressure on the MTC, which limits the amount of data that can be compared to this study. The higher reported MTC is a linear addition model prediction using similar correlations as the case 2 prediction and the lower value is an experimentally measured MTC. The predicted values and experimental data are different between the two studies primarily because of the small variation in pressure (267 kPa for this study vs. 200 kPa for Wu et al.), inlet gas composition, and isotherm parameters used. However, both studies are consistent in that 104

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